Hamish Blake and Andy Lee's latest gap year adventure had a sluggish start while the return of sci-fi series Under The Dome failed to capture the imagination of viewers.
Hamish & Andy's Gap Year South America launched on Tuesday with 983,000 viewers to finish seventh on OzTAM's overnight rankings.
The ratings are well down on last year's launch of the Nine Network's special series Hamish & Andy's Gap Year Asia which attracted 1.566 million watchers to be the highest ranked show on the night.
In fact, Gap Year Asia was a ratings sensation in 2013 and regularly topped the ratings with more than 1.4 million viewers.
The first night ratings may indicate the antics of the popular comedy pair are starting to wear thin with viewers.
On the same night that Hamish & Andy's Gap Year South America was unleashed, Ten started the second season of the sci-series Under The Dome.
The US show, which had moderate success last year, attracted just 625,000 viewers to come in 18th overall.
It finished behind the ABC1 special Hanging With Hoges, about the life of Crocodile Dundee star and former Aussie TV icon Paul Hogan, which was 16th with 641,000.
The Seven Network claimed the first two places on the overnight ratings with House Rules (1.514 million) and Seven News (1.253 million).
Most watched shows on Tuesday.
1. House Rules (Seven) - 1.514 million
2. Seven News (Seven) - 1.253 million
3. Nine News (Nine) - 1.242 million
4. Seven News/Today Tonight (Seven) - 1.140 million
5. Nine News 6.30pm (Nine) - 1.108 million
6. MasterChef (Ten) - 991,000
7. Hamish & Andy's Gap Year South America (Nine) - 983,000
8. Home And Away (Seven) - 960,000
9. Winners & Losers (Seven) - 941,000
10. ABC News (ABC1) - 883,000
16. Hanging With Hoges (ABC1) - 641,000
18. Under The Dome (Ten) - 625,000
- Source OzTAM